Stand-up paper bag

ABSTRACT

A stand-up paper bag is provided with a bottom panel; two major panels joined one ends wherein one major panel includes a first fold line formed with the bottom panel; and two minor panels each joined the major panels, each minor panel including a crease. The bottom panel includes a first sub-panel adjacent to the first fold line, an extension distal the first fold line, a second sub-panel between the first sub-panel and the extension, a second fold line between the first sub-panel and the second sub-panel, a third fold line between the extension and the second sub-panel, a first triangular incision on one ends of the first and second sub-panels, and a second triangular incision on other ends of the first and second sub-panels.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to paper bags and more particularly to a paper bag capable of standing erect.

2. Description of Related Art

A conventional paper bag A is shown in FIGS. 1 to 6 and comprises two opposite major panels A1 joined a top edge, two opposite minor panels A2, a bottom panel A4, and an internal space A3. The bottom panel A4 has a fold line A11 on one edge integrally formed with one major panel A1, an extension A41 adjacent to the other edge, and a fold line A42 for separating the extension A41 from a main portion of the bottom panel A4. After placing item(s) in the space A3, a person may fold the bottom panel A4 along the fold line A11 until the extension A41 is engaged with an inner surface of one major panel A1 and hidden. Thereafter, the paper bag A can stand erect (see FIG. 3).

It is often that a plurality of paper bags A are stacked together for shipping. Each of the minor panels A2 may be collapsed inwardly to form a crease A21 due to weight of items in the paper bags A. However, the bottom panel A4 may be projected outwardly to form a fold line A43 along its central portion (see FIG. 4). Further, the fold line A43 may be rigid after the paper bags A reaching the destination. Unfortunately, the paper bag A is not capable of standing erect (see FIGS. 5 and 6).

Thus, the need for improvement still exists.

SUMMARY OF THE INVENTION

It is therefore one object of the invention to provide a stand-up paper bag comprising a bottom panel; two major panels joined one ends wherein one major panel includes a first fold line formed with the bottom panel; and two minor panels each disposed between and joined the major panels, each of the minor panels including a lengthwise crease; wherein the bottom panel includes a first sub-panel adjacent to the first fold line, an extension distal the first fold line, a second sub-panel formed between the first sub-panel and the extension, a second fold line formed between the first sub-panel and the second sub-panel, a third fold line formed between the extension and the second sub-panel, a first triangular incision formed on one ends of the first and second sub-panels, and a second triangular incision formed on other ends of the first and second sub-panels.

The above and other objects, features and advantages of the invention will become apparent from the following detailed description taken with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a conventional paper bag with the bottom panel extended;

FIG. 2 is a view similar to FIG. 1 with the bottom panel being folded to close the open bottom;

FIG. 3 is a perspective view of the assembled paper bag;

FIG. 4 is a perspective view of the paper bag showing pressure exerted thereon to protrude the bottom panel;

FIG. 5 is a perspective view of the paper bag showing a possible fall-over thereof due to the projecting fold line of the bottom panel;

FIG. 6 is a side elevation of a lower portion of the paper bag showing the projecting fold line of the bottom panel;

FIG. 7 is a perspective view of a stand-up paper bag according to a first preferred embodiment of the invention with the bottom panel extended;

FIG. 8 is a view similar to FIG. 7 with the bottom panel folded to close the open bottom;

FIG. 9 is a perspective view of a lower portion of the assembled paper bag of the first preferred embodiment;

FIG. 10 is a side elevation of a lower portion of the paper bag of the first preferred embodiment showing the flat bottom panel stably rested upon the ground;

FIG. 11 is a perspective view showing multiple paper bags of the first preferred embodiment stacked together;

FIG. 12 is a perspective view of one of the paper bags in FIG. 11 showing the bottom panel being pressed outward by item(s) packaged in the paper bag;

FIG. 13 is a stand-up paper bag according to a second preferred embodiment of the invention with the major panel, the minor panels, and the bottom panel extended;

FIG. 14 is a view similar to FIG. 13 showing both the minor panels folded;

FIG. 15 is a view similar to FIG. 14 showing the half-finished paper bag of the second preferred embodiment; and

FIG. 16 is a perspective view showing multiple paper bags of the second preferred embodiment stacked together.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 7 to 12, a stand-up paper bag 1 in accordance with a first preferred embodiment of the invention is shown and comprises two major panels 11 joined one ends, two minor panels (i.e., sides) 12 each disposed between and joined the major panels 11, and a bottom panel 13. One major panel 11 has one fold line 111 integrally formed with the bottom panel 13. A crease 121 is formed lengthwise along a center of each minor panel 12. The bottom panel 13 has two sub-panels 131 in which one sub-panel 131 is adjacent to the fold line 111, and an extension 132 distal the fold line 111. A fold line 1311 is formed between the two sub-panels 131. A fold line 1321 is formed between the extension 132 and the other sub-panel 131. A triangular incision 133 is formed on one ends (or the other ends) of the sub-panels 131.

After placing item(s) in the bag 1, a person may first fold the bottom panel 13 along the fold line 111. Next, the person may fold the extension 132 toward the top major panel 11 along the fold line 1321 until the extension 132 is engaged with an inner surface of the top major panel 11 and hidden (see FIGS. 7 and 8). Further, push the bottom panel 13 inward along the fold line 1311 until the two joining edges of each incision 133 are engaged with the ends of the corresponding minor panel 12 (see FIGS. 9 and 10).

It is often that a plurality of paper bags 1 are stacked together for shipping (see FIG. 11). Each of the minor panels 12 of one paper bag 1 may be collapsed inwardly along the crease 121 due to weights of items in the stacked paper bags 1 thereabove. Also, the bottom panel 13 may be projected outwardly along the crease 1311 to be flat (see FIG. 12). Thus, the paper bag 1 is capable of standing erect. It is understood that after removing the items from the paper bag 1, a person may push the bottom panel 13 to return the paper bag 1 to its ready to use position.

Referring to FIGS. 13 to 16, a stand-up paper bag 1 in accordance with a second preferred embodiment of the invention is shown. The characteristics of the second preferred embodiment are substantially the same as that of the first preferred embodiment except the following:

A plurality of elongated holes 1A are formed in each fold line 1311, 1321, or 111 (or crease 121). The holes 1A facilitate the folding operation of the panels.

While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modifications within the spirit and scope of the appended claims. 

What is claimed is:
 1. A stand-up paper bag comprising: a bottom panel; two major panels joined one ends wherein one major panel includes a first fold line formed with the bottom panel; and two minor panels each disposed between and joined the major panels, each of the minor panels including a lengthwise crease; wherein the bottom panel includes a first sub-panel adjacent to the first fold line, an extension distal the first fold line, a second sub-panel formed between the first sub-panel and the extension, a second fold line formed between the first sub-panel and the second sub-panel, a third fold line formed between the extension and the second sub-panel, a first triangular incision formed on one ends of the first and second sub-panels, and a second triangular incision formed on other ends of the first and second sub-panels. 